Which of the following best describes an OLAP system?

An OLAP (Online Analytical Processing) system is best described as a data access architecture designed specifically for retrieving and analyzing large volumes of data effectively. OLAP systems allow users to perform multidimensional analysis of business data, facilitating quick access to the information needed for decision-making. They enable complex calculations, trend analysis, and sophisticated data modeling, which are crucial for generating insights from large datasets.

The focus of an OLAP system is on providing a framework that supports the rapid querying and analysis of data, as opposed to simply storing it or manipulating it in a traditional sense. By structuring data in a way that allows for efficient retrieval and analysis, OLAP systems enhance business intelligence processes and support strategic planning.

In contrast, other options like data dictionaries, data manipulation processes, or concepts of online data storage do not capture the primary purpose and functionality of OLAP systems, which is centered around enabling users to access and analyze data efficiently and quickly.